The place is easy to find, in the center of the city, near a huge (Lumpini) park, very clean, good wireless internet, air-condition, nice small western (and thai) restaurants around.
Evan's system to give/take back the key was very convenient, he explained me everything in a message, so I didn't have to adjust my schedule and could arrive / leave anytime.
Evan is very organized, well prepared to host, attentive to the details, and that makes the stay nice. His dogs are adorable.
Thinking of my next trip to Bangkok, and I plan to stay at Evan's place again.